问题
多项选择题
用于降低氧浓度达到窒息灭火的气体有()。
A.二氧化碳
B.氮气
C.氯气
D.水蒸气
答案
参考答案:A, B, D
用于降低氧浓度达到窒息灭火的气体有()。
A.二氧化碳
B.氮气
C.氯气
D.水蒸气
参考答案:A, B, D
用下面框中提供的信息补全对话(其中有两个选项是多余的)
B: Hello, Jack! 小题1: You look worried and upset. A: 小题2: I really need your help. B: Oh, what’s your problem? A: Well. 小题3: But now it becomes more and more difficult since I am in Grade Three. My parents don’t allow me to play basketball. B: Maybe your parents are right. 小题4: A: I see. I do well in all my lessons and I should be allowed to do the things that I’m interested in. B: OK. 小题5: A: Thank you, Mr. Black. It’s very kind of you. |